人工海水中の構造用鋼の疲労き裂進展
き裂先端で発生するキャビテーションの影響について
1988 年 37 巻 418 号 p. 763-769
詳細
1988 年 37 巻 418 号 p. 763-769
In the previous study, the influence of cyclic frequency on the fatigue crack growth rate in liquid environments was investigated. The corrosion fatigue crack growth at high frequencies was found to decrease to almost the same value as that in the laboratory air, possibly due to the gaseous phase produced by the cavitation bubbles gushing at the tip of the crack.
In this study, the influence of cavitation bubbles on the fatigue crack growth behavior in synthetic seawater was investigated in terms of stress waveform. When the stress waveform with a constant period changed its rising rate to a high value, the cavitation bubbles were observed at the tip of the crack, and the corrosion fatigue crack growth rate approached to the value obtained in laboratory air.
